ECU INFINITI QX56 2011 Factory Service Manual

WCS
COMBINATION METERWCS-27
< ECU DIAGNOSIS INFORMATION >
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11
(G) Ground Enter switch signal Input Ignition
switch
ONWhen switch (enter
switch) is pressed
0 V
Other than the above 5 V
12
(O) Ground Select switch signal Input Ignition
switch
ONWhen switch (select
switch) is pressed
0 V
Other than the above 5 V
13
(W/R) Ground
Illumination control switch
signal (+) InputIgnition
switch
ON When switch [illumi-
nation control switch (+)] is
pressed
0 V
Other than the above 5 V
14
(R) Ground Illumination control switch
signal (
−) InputIgnition
switch
ON When switch [illumi-
nation control switch (
−)] is
pressed 0 V
Other than the above 5 V
15
(R/W) Ground Air bag signal Input Ignition
switch
ONAir bag warning lamp
ON
4 V
Air bag warning lamp
OFF 0 V
18
(W/R) Ground Ambient sensor signal Input — —
19
(V/W) Ground A/C auto amp. connection
recognition signal Input —When A/C auto amp. is
connected
5 V
Other than the above 0 V
20
(B) Ground Ambient sensor ground — Ignition
switch
ON—0 V
21
(L) —CAN-H — — — —
22
(P) —CAN-L — — — —
23
(B) Ground Ground — Ignition
switch
ON
—0 V
24
(V) Ground Fuel level sensor ground — Ignition
switch
ON—0 V
25
(O/L) Ground Alternator signal Input Ignition
switch
ONCharge warning lamp ON 2 V
Charge warning lamp OFF Battery voltage
26
(W) Ground Parking brake switch signal Input Ignition
switch
ONParking brake applied 0 V
Parking brake released 12 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JSNIA0014GB
Revision: 2010 May2011 QX56

WCS-28
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
28
(GR/R) Ground Security signal Input Ignition
switch
ONSecurity indicator lamp ON 0 V
Security indicator lamp
OFF
12 V
29
(BR) Ground Washer level switch signal Input Ignition
switch
ONWasher level switch ON 0 V
Washer level switch OFF 5 V
30
(SB) Ground
Vehicle speed signal
(2-pulse) OutputIgnition
switch
ON Speedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)] NOTE:
The maximum voltage varies de-
pending on the specification
(destination unit).
31
(BR/W) GroundVehicle speed signal
(8-pulse)
OutputIgnition
switch
ONSpeedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)] NOTE:
The maximum voltage varies de-
pending on the specification
(destination unit).
33
(W) Ground SNOW mode signal Input Ignition
switch
ONWhen SNOW mode switch
is pressed
12 V
Other than the above 0 V
34
(BR/Y) Ground Fuel level sensor signal Input Ignition
switch
ON
—
35
(O/B) Ground Seat belt buckle switch sig-
nal (driver side)
InputIgnition
switch
ON When driver side belts is
fastened
12 V
When driver side belts is
unfastened 0 V
36
(G/Y) Ground Passenger seat belt warn-
ing signal
InputIgnition
switch
ON  When driver side seat
belt fastened
 When getting in the pas- senger seat
 When passenger seat belt fastened 12 V
 When driver side seat belt fastened
 When getting in the pas- senger seat
 When passenger seat belt unfastened 0 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JSNIA0015GB
JSNIA0012GB
JSNIA3013ZZ
Revision: 2010 May2011 QX56

WCS
COMBINATION METERWCS-29
< ECU DIAGNOSIS INFORMATION >
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Fail-SafeINFOID:0000000006222689
FA I L - S A F E
The combination meter activates the fail-safe contro l if CAN communication with each unit is malfunctioning.
37
(R/Y) Ground Non-manual mode signal Input Ignition
switch
ONSelector manual mode po-
sition
12 V
Other than the above 0 V
38
(L/W) Ground Manual mode shift down
signal InputIgnition
switch
ON Selector lever DOWN oper-
ation
0 V
Other than the above 12 V
39
(Y/B) Ground Manual mode shift up sig-
nal InputIgnition
switch
ON Selector lever UP operation 0 V
Other than the above 12 V
40
(G/W) Ground Manual mode signal Input Ignition
switch
ONSelector manual mode po-
sition
0 V
Other than the above 12 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
Function Specifications
Speedometer
Reset to zero by suspending communication.
Tachometer
Engine coolant temperature gauge
Engine oil pressure gauge
Illumination control When suspending communication, changes to nighttime mode.
Information display Odo/trip meter An indicated value is maintained at communications blackout.
Shift position indicator The display turns OFF by suspending communication.
Door open warning The display turns OFF by suspending communication.
Buzzer The buzzer turns OFF by suspending communication.
Revision: 2010 May2011 QX56

WCS-30
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
DTC Index
INFOID:0000000006222690
Warning lamp/indicator lamp ABS warning lamp
The lamp turns ON by suspending communication.
VDC warning lamp
Brake warning lamp
IBA OFF indicator lamp
4WD warning lamp
Malfunction indicator lamp
VDC OFF indicator lamp
CRUISE warning lamp
Low tire pressure warning lamp The lamp blinking caused by suspending communication.
High beam indicator lamp
The lamp turns OFF by suspending communication.
Turn signal indicator lamp
Tail lamp indicator lamp
A/T CHECK indicator lamp
Key warning lamp
ATP warning lamp
Lane departure warning lamp
LDP ON indicator lamp
CRUISE indicator lamp
Oil pressure warning lamp
SNOW mode indicator lamp
TOW mode indicator lamp
CK SUSP indicator lamp
BSW indicator lamp
Function Specifications
Display contents of CONSULT-III Diagnostic item is detected when... Refer to
CAN COMM CIRCUIT
[U1000] When combination meter is not transmitting or receiving CAN communication signal
for 2 seconds or more. MWI-59,
"Diagnosis
Procedure"
CONTROL UNIT (CAN)
[U1010]
When detecting error during the initial diagnosis of the CAN controller of combina-
tion meter. MWI-60, "Diagnosis
Procedure"
VEHICLE SPEED
[B2205]
The abnormal vehicle sp
eed signal is input from the ABS actuator and electric unit
(control unit) for 2 seconds or more. MWI-61, "Diagnosis
Procedure"
ENGINE SPEED
[B2267]
If ECM continuously transmits abnormal engine speed signals for 2 seconds or
more. MWI-62, "Diagnosis
Procedure"
WATER TEMP
[B2268]
If ECM continuously transmits abnormal engine coolant temperature signals for 60
seconds or more. MWI-63, "Diagnosis
Procedure"
Revision: 2010 May2011 QX56

WCS
BCM (BODY CONTROL MODULE)WCS-31
< ECU DIAGNOSIS INFORMATION >
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BCM (BODY CONTROL MODULE)
List of ECU ReferenceINFOID:0000000006222524
ECU Reference
BCM BCS-33, "
Reference Value"
BCS-54, "Fail-safe"
BCS-56, "DTCInspectionPriorityChart"
BCS-57, "DTCIndex"
Revision: 2010 May2011 QX56

WT-1
SUSPENSION
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SECTION WT
A
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WT
N
O PCONTENTS
ROAD WHEELS & TIRES
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Service Notice or Precautions for TPMS ...................4
Service Notice or Precautions for Road Wheel .........4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Special Service Tools .......................................... ......5
Commercial Service Tools ........................................5
SYSTEM DESCRIPTION ..............................6
COMPONENT PARTS ................................... .....6
Component Parts Location .................................. ......6
Component Description .............................................7
Low Tire Pressure Warning Control Unit ...................7
Transmitter ................................................................7
Tire Pressure Receiver .............................................8
Low Tire Pressure Warning Lamp .............................8
SYSTEM ..............................................................9
System Description ............................................. ......9
Tire Inflation Indicator Function ...............................10
DIAGNOSIS SYSTEM (LOW TIRE PRES-
SURE WARNING CONTROL UNIT) ..................
12
CONSULT-III Function ........................................ ....12
ECU DIAGNOSIS INFORMATION ..............14
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ..................................................... ....
14
Reference Value ................................................. ....14
DTC Inspection Priority Chart .................................17
DTC Index ...............................................................18
WIRING DIAGRAM ......................................19
TIRE PRESSURE MONITORING SYSTEM ......19
Wiring Diagram .................................................... ....19
BASIC INSPECTION ...................................25
DIAGNOSIS AND REPAIR WORK FLOW .......25
Work Flow ............................................................ ....25
ADDITIONAL SERVICE WHEN REPLACING
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ........................................................
27
Description ...............................................................27
Work Procedure .......................................................27
TRANSMITTER WAKE UP OPERATION .........28
Description ...............................................................28
Work Procedure .......................................................28
ID REGISTRATION ...........................................29
Description ...............................................................29
Work Procedure .......................................................29
DTC/CIRCUIT DIAGNOSIS .........................31
C1704, C1705, C1706, C1707 LOW TIRE
PRESSURE .......................................................
31
DTC Logic ............................................................ ....31
Diagnosis Procedure ...............................................31
C1708, C1709, C1710, C1711 TRANSMITTER
(NO DATA) ........................................................
33
DTC Logic ............................................................ ....33
Diagnosis Procedure ...............................................33
C1716, C1717, C1718, C1719 TRANSMITTER
(PRESSURE DATA) ..........................................
37
DTC Logic ............................................................ ....37
Diagnosis Procedure ...............................................37
C1728 RECEIVER ID ........................................39
Revision: 2010 May2011 QX56

WT-12
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL
UNIT)
CONSULT-III FunctionINFOID:0000000006225496
APPLICATION ITEMS
CONSULT-III performs the following functions in combinat ion of data reception, instruction, and transmission
via communication lines from low tire pressure warning control unit.
*: The following diagnosis information is erased by erasing.
DTC
ECU IDENTIFICATION
Part number of low tire pressure warning control unit is displayed.
SELF DIAGNOSIS RESULTS
Refer to WT-18, "DTC Index".
DATA MONITOR
ACTIVE TEST
NOTE:
After completing the work below, perform an active test.
1. Check ID registration state and perform self-diagnosis.
2. Erase the self-diagnosis result history.
Mode FUNCTION DESCRIPTION
ECU IDENTIFICATION Displays the part number of low tire pressure warning control unit.
SELF-DIAGNOSIS RESULTS Self-diagnosis result can be quickly read.
*
DATA MONITOR Input and output data of low tire pressure warning control unit can be read.
ACTIVE TESTSends command to the low tire pressure warning control unit to change output signals and check
operation of output system.
WORK SUPPORT Components can be quickly and accurately adjusted.
Monitor item (Unit) Remarks
VHCL SPEED SE
[(km/h) or (MPH)] Vehicle speed is displayed.
AIR PRESS FL
[(kPa), (kg/cm
2) or (Psi)] Air pressure of front LH tires is displayed.
AIR PRESS FR
[(kPa), (kg/cm
2) or (Psi)] Air pressure of front RH tires is displayed.
AIR PRESS RR
[(kPa), (kg/cm
2) or (Psi)] Air pressure of rear
RH tires is displayed.
AIR PRESS RL
[(kPa), (kg/cm
2) or (Psi)] Air pressure of rear
LH tires is displayed.
ID REGST FL1 ID registration status of front LH transmitter is displayed.
ID REGST FR1 ID registration status of front RH transmitter is displayed.
ID REGST RR1 ID registration status of rear RH transmitter is displayed.
ID REGST RL1 ID registration status of rear LH transmitter is displayed.
WARNING LAMP Control status of low tire pressure warning lamp is displayed.
BUZZER Control status of buzzer in combination meter by low tire pressure warning con-
trol unit is displayed.
NOTE:
Not use in TPMS, but displayed.
Revision: 2010 May2011 QX56

WT-14
< ECU DIAGNOSIS INFORMATION >
LOW TIRE PRESSURE WARNING CONTROL UNIT
ECU DIAGNOSIS INFORMATION
LOW TIRE PRESSURE WARNING CONTROL UNIT
Reference ValueINFOID:0000000006225497
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The reference values in the table below come from the control unit calculation data. The normal values
may in some cases be displayed even though the power circuit (harness) is open or shorted.
TERMINAL LAYOUT
PHYSICAL VALUES
CAUTION:
When using circuit tester to measure voltage for in spection, be sure not to extend forcibly any con-
nector terminals.
Monitor item Condition Value/Status
VHCL SPEED SE Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (Inside of
±
10%)
AIR PRESS FL Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
front LH tire
AIR PRESS FR Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
front RH tire
AIR PRESS RR Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
rear RH tire
AIR PRESS RL Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
rear LH tire
ID REGST FL1 Front LH transmitter ID registered Done
Front LH transmitter ID unregistered Yet
ID REGST FR1 Front RH transmitter ID registered Done
Front RH transmitter ID unregistered Yet
ID REGST RR1 Rear RH transmitter ID registered Done
Rear RH transmitter ID unregistered Yet
ID REGST RL1 Rear LH transmitter ID registered Done
Rear LH transmitter ID unregistered Yet
WARNING LAMP Low tire pressure
warning lamp: ON On
Low tire pressure warning lamp: OFF Off
JSEIA0024ZZ
Revision: 2010 May2011 QX56

LOW TIRE PRESSURE WARNING CONTROL UNIT
WT-15
< ECU DIAGNOSIS INFORMATION >
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Te r m i n a l N o . (Wire color) Description
Condition Value (Approx.)
Signal name Input/
Output
1
(P) —CAN-L Input/
Output ——
2
(L) —CAN-H Input/
Output ——
3
(O/L) Ground Tire pressure receiver rear
RH signal Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
4
(L) Ground
Tire pressure receiver rear
LH signal Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
OCC3879D
OCC3880D
OCC3879D
OCC3880D
Revision: 2010 May2011 QX56

WT-16
< ECU DIAGNOSIS INFORMATION >
LOW TIRE PRESSURE WARNING CONTROL UNIT
5
(R/L) Ground
Tire pressure receiver front
RH signal Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
6
(W/G) Ground Tire pressure receiver front
LH signal
Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
7
(SB) Ground Tire pressure receiver rear
RH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
8
(GR) Ground Tire pressure receiver rear
LH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
9
(R/W) Ground Tire pressure receiver front
RH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
10
(LG) Ground Tire pressure receiver front
LH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
15
(GR) Ground Power supply Input Ignition switch ON Battery voltage
Ignition switch OFF 0 V
19
(L/R) Ground Tire pressure receiver rear
RH signal (sensitivity) InputIgnition switch ON Approx. 0.7 V
Ignition switch OFF 0 V
20
(P) Ground Tire pressure receiver rear
LH signal (sensitivity) InputIgnition switch ON Approx. 0.7 V
Ignition switch OFF 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
Signal name Input/
Output
OCC3879D
OCC3880D
OCC3879D
OCC3880D
Revision: 2010 May2011 QX56